He's saying that the complexity of Arabic calligraphy was enforced onto them because of the spread of Islam, because they were worried that the meaning of the words in the Qur'an would be lost.
Dia mengatakan bahwa kompleksitas kaligrafi Arab telah diterapkan pada mereka karena penyebaran Islam, karena mereka khawatir bahwa arti dari kata-kata dalam Al Qur'an akan hilang.